如何使用 Xcode 调试器打印出属性的内容？
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How to print out a property's contents using Xcode debugger?
提问by Nosrettap
I'm writing an iOS app and I need help using the built-in Xcode debugger. Suppose I have an object called HomeViewControllerthat has three properties
我正在编写一个 iOS 应用程序，我需要使用内置 Xcode 调试器的帮助。假设我有一个名为的对象HomeViewController，它具有三个属性
@property (nonatomic) BOOL finished;
@property (nonatomic, strong) NSArray *myArray;
@property (nonatomic, strong) NSString *myName;
@synthesize finished = _finished, myArray = _myArray, myName = _myName;
Suppose I have a breakpoint in this class. How would I view the contents of these properties? I've tried things such as po myName, print myNameand print [self myName]but I can't figure out how to do this. I've tried using LLDB but I keep getting the same error that this person encountered (lldb fails to print variable values with "error: reference to 'id' is ambiguous") . The accepted answer to this question was, LLDB is broken and that I should just use GDB; however, I refuse to accept that something so fundamental is broken.
假设我在这个类中有一个断点。我将如何查看这些属性的内容？我试过的东西，如po myName，print myName和print [self myName]，但我无法弄清楚如何做到这一点。我试过使用 LLDB，但我不断收到此人遇到的相同错误（lldb 无法打印变量值并显示“错误：对 'id' 的引用不明确”）。这个问题的公认答案是，LLDB 坏了，我应该只使用 GDB；然而，我拒绝接受如此基本的东西被打破了。
Nevertheless, I've also tried using GDB with similar commands as above; however, I can't get GDB to work either. Help please
尽管如此，我也尝试过使用 GDB 和上述类似的命令；但是，我也无法让 GDB 工作。请帮忙
回答by pasawaya
Once you place a breakpoint, run, and the program stops at the breakpoint, hover your cursor over the variable/value you want to see like this:
放置断点后，运行，程序在断点处停止，将光标悬停在要查看的变量/值上，如下所示：
You could also place an NSLog(@"%@", yourLabel.text);to view the contents of that label/other object type.
您还可以放置NSLog(@"%@", yourLabel.text);以查看该标签/其他对象类型的内容。
One other option is to run GDB in the console like this:
另一种选择是在控制台中运行 GDB，如下所示：
gdb
attach <your process name>
And then use the po(print-object) command to view the value of a variable like this:
然后使用po(print-object) 命令查看变量的值，如下所示：
po variableName
To view the value of primitive types (int, float, long, double, char, etc.), you can just use the printcommand while running GDB in the console like this:
要查看原始类型（int, float, long, double, char, 等）的值，您可以print在控制台中运行 GDB 时使用该命令，如下所示：
print yourPrimitiveVariable
Hope this helps!
希望这可以帮助！
EDIT:
编辑：
With the pocommand, you can print out the value of an object using both the property name (self.myProperty) or the ivar name (possibly _myProperty). I demonstrate this here:
使用该po命令，您可以使用属性名称 ( self.myProperty) 或 ivar 名称（可能_myProperty）打印出对象的值。我在这里演示：
回答by Bhavik Modi
Try with following expression in debug area to print object,
尝试在调试区使用以下表达式打印对象，
p self.view.bounds.size.width
or use,
或使用，
po self.view
p - Print is only uses to print normal/simple values while, po - Print Object works same as NSLog to print value of an object
p - 打印仅用于打印普通/简单值，而 po - 打印对象的工作方式与 NSLog 相同，用于打印对象的值
